Making chilled rolls.



E. L. PATCH. MAKING OHILLED-ROLLS.

APPLICATION FILED ooT.11, 1913.

1,084,1@5 Patented Jan 13,1914.

d ac/ EVEN L. PATCH, OF J'OHNSTOWN, PENNSYLVANIA.

MAKING CHILLED ROLLS.

rosados.'

Specification of Letters Eatent. v

Application filed October 11, 1913'.

Patented Jan. 13, 1914. serial No."?94,542.

To all 'whom it may concern:

Be it known that I, EVEN L. PATCH, a citizen of the United States, residing in the city of Johnstown, in the county of Cambria and State of Pennsylvania., have invented certain new and useful Improvements in Making Chilled Rolls; and I dohereby declare the following to be a full; clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in method and apparatus `used in making chilled rolls, that is, those which have portions of their surfaces chilled or hardened, and is especially adapted to the manufacture o-f rolls from cast iron of different kinds, which rolls may be used in angle straightening machines, rolling mills and for other purposes.

One of the particular points of my nven tion is to produce a chilled or hard metal in rentrant angles or grooves of rolls of this character.

lt is a comparatively simple matter to provide a metal chill which will inturn chill or harden t-he outwardly extending portions or angles of the rolls which are cast in the reentrant angles of the chill, the reason being that there is `ample material in that portion of the iron or other metal chill to extract the heat from the outwar `y extending angle or comparatively thin 'portion of the rolls at the place stated. 0n the other hand it has hitherto been difhcult or impossible to obtain achill of equal hardness and depth in the reentrant angle of a chilled roll7 as chilling at this place is only caused by the thin or sharp angular point of the chill which is substantially surrounded by the hot cast metal and therefore does not extract the heat sumciently nor fast enough to produce the chill in the part of the roll adjacent thereto. l,

` therefore, so construct my chill that a cooling medium is introduced into the outwardly extending angles or thin portions of the chill, which7 in turn, extract-s the heat from the re'e'ntrant angle of the rolls with substantially thel same speed as the heat loss of the other portions of the roll, whereby a uniform hard chill is produced throughout the roll surfaces. This chill and hardening in the reentrant angles of the rolls is particularly essential by reason of the fact that when in use the intensity of pressures at this point are very great and require the best and hardest material to withstand them.

Having t-hus given a general description of my invent-ion, I will now, in order to 'make the matter more clear, refer to the accompanying one sheet of drawings forming part of this specification, and in which like characters represent like parts.

Figure 1 is a vertical sectional elevation of my casting apparatus showing my fluid cooled chill `in position to receive molten metal. Section is taken on line Is-I of F 1g. 2. Fig. 2 is a vertical sectional elevation taken on a plane at right angles with ythat of Fig. 1, namely o`n plane II-II of Fig. 1. Fig. 3 is a plan view of my apparatus. Fig. 4 is'a side elevation of my improved chill. Fig. 5 is a longitudinal section of the chilled workin@r surfaces of a groove in a pair of rolls made in accordance with' my invent-ion, showing an angle bar therein in the process of being straightened. In this figure the hard or chilled iron is indicated by irregular lines which are substantially perpendicular to the external surfaces of the rolls.

Referring now to the various characters of` reference on the drawings z-l indicates the base plate of al flask 2 the lower or drag portion of the same; 3 indicates refractory sand or other mold material in the lower part of the mold; i indicates generally, my chill, which is preferably made of cast iron or other metal adapted to quickly extract heat from molten metal poured therein; 5 indicates the rentrant angles of the chill which form the projecting angles of the rolls cast j therein.

6 represents rabbets formed in one-half of my chill, into which thetongues 7 fit, as shown, for the purpose of centralizing and positioning these two portions with respect to each other.

8 indicates bolts for securing the two portions together by their outwardly projecting iianges, as shown.

9-9 are dowel pins located in one half of the chill, adapted to lit in corresponding holes in the other half, in order to position the same longitudinally with respect to each other.

l0 are pipes or conduits adapted for the circulation of the cooling Huid therethrough connected with one-half of my chill, and 11. are similar pipes connected with the other half, both pipes 10 and 11 "being connected together by unions, return bends and by a T 12 as shown. These pipes are preferably cast in the chills and are arranged in the apices of the projecting angles of said chills,'as clearly show'n in the illustrations, in such a way as to add to the cooling effect of the comparatively small amount of metal in said projecting angles, whereby the molten metal in the rentrant angle of the roll cast in said chill is properly cooled. The pipes 10 and 11 are connected at their other ends wit-h the pipe 13, which latter pipe I prefer to-use as the inlet for cooling water or medium which is introduced into said pipe, thence iows through the same and its connections and nally issues from the Y pipe 12, having done its work meanwhile in the manner described. It should also beV noted that the return bends and other curved connections enables me to introduce a cooling medium into all parts of the two halves of my mold at the same time, and these are so arranged as to be quickly and readily taken apart. by unscrewing the unions 26 and taking out the bolts 8, whereby the chills may be separated after the casting is made, in order to enable the same toV be withdrawn from the mold. rlhe upper portion of my mold is indicated at 14: which is lined with refractory sand ormaterial 15, as shown, to form one of the roll necks and is further provided with a funnel-shaped opening as shown at ythe top, adapted to serve as a riser orsink head. The pouring gate 16 is lined with refractory material 17 in the manner indicated in Figs. 2 and 8. Lifting lugs 18 are provided on the halves of the chill as shown, and the various portions `of the mold are Asecured together'by means of the anges 20 and the clamps 19.

The body portions of external projections of rolls cast by my method and apparatus are indicated as 21 and 22; the external angular portions shown with flattened apices are indicated as 23 formed in the reentrant angle of the chill. The internal or rentrant angles of the rolls which are particularly adapted to be chilled uniformly with the other portions by means of my method and apparatus, are indicated als 24.' A metal angle in the process of straightening in one of the passes between a pair of my rolls is indicated as 25. The internal surface of my chill is shown as a surface of revolution around its central A. axis, but I do not limit myself to this form, and may use other configurations of the 'rso' The operation of my method and apparasame, as may be desired 'or expedient.

tus is as follows: The :mold being formed ":gfnd set up as illustrated in the drawings,

molten metal is poured into the gate 16,

flows downwardly thence into the lower portion of the mold, rises and fills the same, the sum or washings floating on the surface of the metal in the funnel riser head, indicated in Figs. 1 and 2. During this operation water or other cooling fluid is introduced through the pipe 13, as indicated by the arrow in Fig. 1, Hows thence through the communicating pipes or channels which, are located in the externally projecting'portions of the chill as shown, and issues from the discharge pipe 12. The cooling 'effect of the chill, due to the conduction of the heat through the same and the radiation and conduction of the said heat from its exterior surface, is assisted by the cooling effect of the medium which passes through the cooling pipes. In this manner these projecting or thin port-ions of the chill, which would not otherwise be adapted to produce the required cooling effect, are assisted by the circulationrof a cooling medium therethrough, so that a uniform hard chill is produced on the casting.

Although I have shown and described my improvements in considerable detail, I do not wish to be limited to the exact and specific details shown and described, but may use such substitutions, modications or equivalents thereof, as are embraced within the scope of my invention, or kas pointed out in the claims.

Having thus described my invention,what I claim and desire to secure by Letters atent is 1. A metal chill the chilling surface of which is provided with projections and depressions, conduits in said projections and means for supplying a cooling medium thereto.

2. A metal chill provided with alternating projections and depressions in the chilling mold surface thereof, conduits formed near the apices of said projections and means for supplying a cooling medium thereto.

3. A metal chill provided with alternating annular internal projections and depressions in the chilling mold surface thereof, conduits formed in said chill near the apices of said projections and means for supplying a cooling medium to said con duits.

4. A metal chill of substantial thickness, the internal chilling mold surface being formed with alternating annular projections and depressions, conduits formed therein near the apices of said projections, tubular connections to said conduits and means for supplying a cooling medium thereto.

5. An annular metal chill the internal surface of which is formed with alternating annular projections and depressions, conduits formed in said chill near the apices a cooling medium to said conduits. Y

Locales 6. AL metal chill of substantially annular shape, formed in halves adapted to be re movahly secured together, the internal surface thereof being provided with alternating annular projections and depressions, conduits formed in the apices of the `said annular projections, means connecting the conduits in' the two portions of said chill provided with inlet and outlet openings and means for supplying a cooling medium thereto.

7. A metal chillV of substantially annular shape, formed in halves adapted to be rej movably secured together,l the internal sur faces thereof'beingzprovided with' alternating annular projections and depressions of angular cross section, conduits formed in the apices of the said angular projections, means connecting the conduits yin the two portions of said chill provided with inlet and outlet openings and means for supplying cooling medium thereto.

8. The method' of casting chilled rolls with annular projections and adjacent annular depressions in the surface of the body portion thereof, which consists in casting molten metal into a metal chill provided with corresponding annular grooves and projections and by supplementary means cooling the projecting portions of the annular projections of said chill, whereby a uniform cooling effect is transmitted to the casting and a uniform hardening is effected throughout the surface of said roll.

9. The method of casting chilled rolls with annular grooves and projections in the body portion thereof, which consists in casting molten metal into a chill provided with corresponding annular projections and grooves, and cooling the projecting portions of the annular projections of said chill by circulating a cooling medium therethrough, whereby a uniform chill is formed on, and adjacent to, the roll surfaces.

In testimony whereof I hereto aix my signature in the presence of two witnesses. v EVEN L. PATCH. Y lvitnesses:

ELMnnSEAvEY, JNQ. H. Do'rr. 

